Cortana is Windows Phone’s answer to Siri on iOS and Google Now for Android. In the words of Microsoft:
“Cortana is powered by Bing. She comes to recognize you by learning your comforts and interests over the long time. She pays special mind to you, gives proactive, valuable proposals.”
iOS has Siri, Android has Android Now and Cortana for Windows Phone: All three smartphone platforms have their individual digital assistant. Each of them has their personal quirks and exceptional proficiencies. Cortana is distinguished because of its broader integration into a phone’s contacts and compelling some time to study your likes and preferences as well as its Bing Integration.
Microsoft is already attempting to convey Cortana to Windows 10. It will probably be a cloud-based service, with customer for input and content delivery on the PC; yet a great part of the hard work done in the background online.
Even if iPhone has a Mac version of Windows, It’s not actually clear how Cortana for it will help sell Microsoft software. The key for the success and victory of Cortana will know by where a client is and what they are attempting to do.
Cortana is the best example for the Windows Phone App Development arena.
Source : http://bit.ly/1FHLNgd